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This digital terrain model (DTM) was produced as part of an effort to characterize topography within candidate landing ellipses for the Mars2020 mission and to aid entry, descent, and landing simulations for the mission. The DTM was constructed from a pair of CTX images using the stereo photogrammetry software SOCET SET (BAE Systems).

The DTM has been used to orthorectify the input images at 6 meters/pixel and to calculate topographic slopes at a 20 meter baseline. These are available under the "Related Products" section on the right of this page.

General

Purpose

This digital terrain model (DTM) was produced as part of an effort to characterize topography within candidate landing ellipses for the Mars2020 mission and to aid entry, descent, and landing simulations for the mission.

Keywords

Contact and Distribution

Access Constraints

Public Domain

Use Constraints

Please Cite Authors

Data Status and Quality

Currentness Reference

Publication date

Progress

Complete

Update Frequency

None planned

Process Description

The DTM processing work-flow consists of the following steps:
(1) Automatically generate and place tiepoints in the stereoimages and perform a relative adjustment to bring the images into alignment
(2) Create a low resolution (typically 100 m/post) DTM from the relatively adjusted stereopair
(3) Absolutely control the low resolution DTM to the available reference data (MOLA, or HRSC) using the Ames Stereo Pipeline program pc align
(4) Apply the transformation to the ground coordinates previously calculated for the tiepoints, placing them in alignment with the reference
(5) Perform a final adjustment with the tiepoints converted to XYZ points at their transformed locations
(6) Perform interactive quality control and editing to remove artifacts introduced in the matching step
(7) Export the final DTM and orthorectified images

The exported DTM is then used to calculate adirectional topographic slopes at a horizontal baseline of 20 meters.